Suppose Hydrogen Sulfide Is Added to a Solution That Is

question 69

Multiple Choice

Suppose hydrogen sulfide is added to a solution that is 0.0010 M in Fe²⁺,Cd²⁺,Co²⁺,and Mn²⁺ such that the concentration of H₂S is 0.10 M.When the pH of the solution is adjusted to 3,a precipitate forms.What is the composition of the precipitate?
H₂S(aq) + 2H₂O(l)
2H₃O⁺(aq) + S^2-(aq) ; K_c = 1.1 × 10^-20
Salt
K_sp
FeS
6) 0 × 10^-18
CdS
8) 0 × 10^-27
CoS
4) 0 × 10^-21
MnS
2) 5 × 10^-10

• A)CdS only
• B)CdS,CoS,FeS,and MnS
• C)CdS,CoS,and FeS
• D)CdS and FeS
• E)CdS and CoS

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Definitions:

Incisors

The front teeth in mammals that are primarily used for cutting food.

Bicuspids

Also known as premolars, these are types of teeth located between the canines and molars, used for grinding food.

Molars

Molars are large, flat teeth at the back of the mouth, used primarily for grinding food.

Permanent Set

A long-lasting alteration of form or position, especially in hair styling, or a condition of being fixed in a particular stance or position.